MECHANICAL SEPARATION 309 will be set up. Some form of flexible mounting is necessary. Top-drive extractors are well-suited to textiles except when they are in the piece. For piece goods an under-driven goods machine is preferable for ease in loading and unloading. The under- FIG. 31.—Sharpies centrifuge. driven machine is also required when batches of material are brought to the separators in removable baskets.